Summer Mole Changes: 70% Experienced Anxiety, But Only 23.7% Sought Medical Attention

Key Findings from This Survey:

Conclusion: Moles that suddenly grow larger are not necessarily dangerous, but a visit to a dermatologist is recommended. You can self-check for differences between moles and melanoma using the "ABCDE criteria" (Asymmetry, Border, Color, Diameter, Evolution). If you notice changes in a mole, please consult a dermatologist first.

- 68.3% of respondents have experienced changes in their moles during the summer. - A majority of 76.3% felt anxious about the changes but did not seek medical attention. - Awareness of the "ABCDE criteria" for self-checking melanoma is only 15.7%.

Glossary:

What is Melanoma (Malignant Melanoma)?

Melanoma is a malignant tumor originating from melanocytes (pigment cells). It is highly aggressive among skin cancers, making early detection and treatment extremely important. Approximately 2,500 new cases are diagnosed annually in Japan, and it tends to occur on the soles of the feet and under the nails.

What are the ABCDE Criteria?

The ABCDE criteria are an international self-checking method for distinguishing between moles and melanoma. It consists of five items: Asymmetry, Border, Color, Diameter, and Evolution.

What is a Dermoscopy Examination?

A dermoscopy examination is a non-invasive diagnostic method that uses a special magnifying lens (dermatoscope) to observe skin lesions. It allows for the observation of fine structures of the skin invisible to the naked eye and is useful in differentiating moles from skin cancer.

Comparison of Benign Moles and Suspected Melanoma Characteristics (ABCDE Criteria)

Check Item

Benign Mole

Suspected Melanoma

A: Asymmetry

Symmetrical

Asymmetrical

B: Border

Clear border

Irregular or notched border

C: Color

Uniform color

Uneven color or multiple colors

D: Diameter

Less than 6mm

6mm or more

E: Evolution

No change over a long period

Changes in size, color, or shape

*These are general guidelines and individual differences may apply.

IC Clinic (Shinjuku, Shibuya, Ueno, Ikebukuro, Tokyo, Omiya branches), operated by Medical Corporation Tetsuketsu-kai, conducted an "Awareness Survey on Summer Mole Changes and Consultation Behavior" ahead of July, when UV radiation is strongest. Our clinic specializes in skin tumors and dermatologic surgery, focusing on the diagnosis and treatment of skin tumors, including mole removal.

Survey Background

As midsummer approaches and UV radiation peaks, skin damage tends to accumulate, leading to an increase in people noticing changes in their moles. While interest in melanoma (malignant melanoma) has been growing in recent years, basic knowledge such as "What should I do if my mole changes?" and "Which department should I consult?" is not yet widespread. This survey was conducted to clarify the general public's perception of mole changes and their actual consultation behavior, aiming to contribute to the early detection of melanoma.

Survey Overview

Target Audience: Men and women aged 20-60 nationwide with opportunities for outdoor activities.

Survey Period: June 15, 2026 - June 24, 2026

Survey Method: Internet survey

Number of Respondents: 300

Survey Results

[Survey Results] Approximately 70% Experienced Mole Changes in Summer

Question: Have you ever experienced any changes in your moles during the summer (June-August)?

This indicates that summer is a time when people are more likely to notice changes in their moles due to UV exposure. However, whether this awareness of "change" leads to actual consultation behavior is another matter.

[Survey Results] About 3 out of 4 Did Not Seek Medical Attention Despite Noticing Changes

Question: When you noticed changes in your mole, did you consult a dermatologist or plastic surgeon?

76.3% of those who noticed changes did not seek medical attention. Notably, 41.0% felt anxious but did not consult, highlighting a significant psychological barrier.

[Survey Results] "Waiting and Seeing" Was Most Common; 1 in 4 "Didn't Know Where to Go"

Question: What was the reason for not seeking medical attention even after noticing mole changes? (Multiple answers possible - select one most applicable)

24.3% of respondents answered, "I didn't know which department to go to," indicating a need to raise awareness that basic information about consulting a dermatologist for mole changes is necessary.

[Survey Results] Awareness of Self-Check Method Remains Around 16%

Question: Do you know the "ABCDE criteria" for distinguishing between moles and melanoma (malignant melanoma)?

It was found that the awareness of the internationally recommended ABCDE criteria is extremely low. It is important to increase opportunities for early consultation by promoting self-check methods.

[Survey Results] "Grew Larger" Was Most Common at 35.7%

Question: What aspect of mole changes concerns you the most?

Many people notice changes corresponding to the ABCDE criteria, such as "grew larger," "changed color," or "changed shape," but they may not be able to evaluate them from a professional perspective.

Survey Summary

This survey revealed that while about 70% of people experience mole changes in the summer, less than 1 in 4 actually seek medical attention. The reasons for not consulting included "decided to wait and see" and "didn't know which department to go to," indicating a lack of correct knowledge about mole changes and information about where to seek consultation. Furthermore, the low awareness of the "ABCDE criteria," useful for early detection of melanoma, at only 15.7% is a serious issue. As UV radiation intensifies in the summer, it is important to pay attention to mole changes and consult a dermatologist promptly if you notice anything concerning.

Doctor's Comment | Dr. Kota Takakuwa, IC Clinic

Based on over 15 years of clinical experience as a dermatologist, I can say that "waiting and seeing" when a mole changes carries the risk of missing an opportunity for early detection of melanoma. If you notice a change in a mole, please consult a dermatologist without hesitation.

What is most concerning from these survey results is that 76.3% of people notice mole changes but do not seek medical attention. Melanoma is a disease where early detection and treatment are extremely important; if detected at Stage I, the 5-year survival rate is over 95%, but the prognosis rapidly worsens if it progresses.

Melanoma in Japanese people often occurs on the soles of the feet and under the nails, differing from its occurrence sites in Western populations. The assumption that "it's okay because it's not an area exposed to sunburn" is dangerous. Furthermore, UV radiation is considered a risk factor for melanoma, making summer UV protection important from a preventive standpoint.

The "ABCDE criteria" are useful as a guide for self-checking, but they are merely a screening tool. If even one of the five criteria is met, it is essential to undergo a dermoscopy examination at a dermatology clinic. Please avoid making self-judgments like "it's probably fine."

The correct place to consult for mole changes is a "dermatologist." Dermatologists use a special magnifying lens called a dermatoscope to observe the fine structures of the skin, which are invisible to the naked eye, and determine if it is benign or malignant. This examination is painless and takes only a few minutes, so you can undergo it without hesitation.

[Evidence] The Guidelines for the Management of Cutaneous Malignant Tumors by the Japanese Dermatological Association recommend regular self-checks of the skin and prompt consultation when changes are noticed for the early detection of melanoma. In my clinical experience as a dermatologist, most melanomas detected early were cases where the patient or their family noticed "something is wrong" and sought consultation.

Key Points for Self-Checking with ABCDE Criteria:

- A (Asymmetry): Is the mole asymmetrical? - B (Border): Is the border irregular or blurred? - C (Color): Are there uneven colors or multiple colors present? - D (Diameter): Is the diameter 6mm or larger? - E (Evolution): Has the size, color, or shape changed?

Situations Requiring Immediate Dermatologist Consultation:

- Rapid increase in mole size over a short period (weeks to months). - Bleeding or oozing from the mole. - Pigment spreading around the mole. - Existing mole's shape becoming distorted. - Pigmented spots on the sole of the foot or under the nail changing.

Summer UV Protection and Skin Cancer Prevention:

- Use sunscreen with SPF 30 or higher and PA+++ or higher, and reapply every 2-3 hours. - Avoid going out between 10 AM and 2 PM when UV radiation is strongest. - Use physical sun protection such as hats, parasols, and long sleeves.

Kota Takakuwa, M.D.

With over 15 years of clinical experience and over 30,000 surgical procedures in the fields of skin tumors and dermatologic surgery, provides supervision based on medical evidence.

Specialties: Skin Tumors, Dermatologic Surgery, Dermatology, Plastic Surgery

- Miradry Certified Physician

Clinical Achievements (as of 2024, cumulative):

- Skin Tumor and Dermatologic Surgery: Over 30,000 cases - Hyperhidrosis Treatment: Over 2,000 cases - Rosacea and Facial Redness Treatment: Over 1,000 cases

Biography:

- 2009: Graduated from the Faculty of Medicine, University of Tokyo - 2009: Tokyo Metropolitan Health and Medical Treatment Corporation Ebara Hospital, Initial Training - 2012: Department of Dermatology, Tokyo Metropolitan Police Hospital - 2012: Department of Dermatology, The University of Tokyo Hospital - 2019: Treatment Director, IC Clinic

Supervised Areas: Skin Tumors (moles, epidermal cysts, lipomas, etc.), Dermatologic Surgery, Skin Cancer, Medical Information related to General Medical Columns.

Frequently Asked Questions (Q&A):

Q1. Is a mole that suddenly grows larger dangerous?

A. It is not necessarily dangerous, but a consultation with a dermatologist is strongly recommended.

In this survey, 35.7% of respondents were concerned about their moles "growing larger." The causes of mole enlargement vary, including natural changes during growth, UV exposure, and hormonal fluctuations. However, if a mole rapidly enlarges over a short period (weeks to months), early consultation is important to rule out malignancy. A dermoscopy examination can determine if it is benign or malignant.

Q2. How can I distinguish between a mole and melanoma?

A. Self-checking is possible with the "ABCDE criteria," but a final diagnosis requires examination by a dermatologist.

In this survey, 84.3% of respondents answered that they "do not know" the ABCDE criteria. This method involves checking for Asymmetry (A), Border irregularity (B), Color variation (C), Diameter of 6mm or more (D), and Evolution (E). If even one criterion is met, seek a dermoscopy examination at a dermatology clinic. Relying solely on self-diagnosis carries the risk of oversight.

Q3. Which department should I consult if my mole changes?

A. Consult a dermatologist.

In the survey, 24.3% of respondents stated, "I didn't know which department to go to." Moles and their changes are treated by dermatologists. Dermatologists use a special magnifying lens called a dermatoscope to determine benign or malignant status and perform excisions or biopsies (tissue examinations) as necessary. Plastic surgeons can also handle these cases, but it is recommended to first seek a diagnosis from a dermatologist.

Q4. What is the relationship between UV radiation and moles/melanoma?

A. UV radiation is considered one of the risk factors for melanoma development.

Ultraviolet radiation (especially UVB) damages the DNA of skin cells, increasing the risk of skin cancers, including melanoma. The fact that 68.3% of respondents experienced mole changes in the summer, as found in this survey, underscores the importance of UV protection. Please take measures such as using sunscreen, wearing hats and using parasols for physical shielding, and avoiding outdoor activities during peak UV hours.

Q5. Is it okay to "wait and see" if a mole changes?

A. Melanoma progresses rapidly, so it is recommended to seek consultation immediately if you notice changes.

While "decided to wait and see" was the most common reason for not seeking consultation in this survey (38.7%), early detection and treatment of melanoma significantly impact survival rates. The 5-year survival rate at Stage I is over 95%, but it drops sharply if the cancer progresses. A dermoscopy examination is painless and takes only a few minutes, so there is no need to hesitate for a "just in case" consultation.

Risks of Neglect:

- If melanoma is missed, the risk of metastasis to lymph nodes and other organs increases. - Advanced melanoma becomes difficult to treat, and the prognosis worsens significantly. - Missing the opportunity for early detection may lead to extensive surgery or chemotherapy that would otherwise have been unnecessary.

Consultation Guidelines for Those Concerned:

- Mole suddenly grew larger in a short period (weeks to months). - Mole's color changed, or multiple colors are mixed. - Mole's shape became irregular, or the border has become blurred. - Mole bleeds, oozes, or repeatedly forms scabs. - Pigmented spots on the sole of the foot or under the nail have changed.

Clinic Information:

Features of IC Clinic:

- Precise diagnosis of skin tumors through dermoscopy examination. - Staffed by physicians with extensive clinical experience in skin tumors and dermatologic surgery. - Wide range of services from mole removal to early detection of skin cancer. - Convenient locations with 5 branches in Tokyo and 1 in Omiya.

IC Clinic Shinjuku: 2F, Imas Aoi Bldg., 2-5-3 Yoyogi, Shibuya-ku, Tokyo

IC Clinic Shibuya: 5F, New Sansui Bldg., 3-16-2 Shibuya, Shibuya-ku, Tokyo

IC Clinic Ueno: 1F, Sankyu Bldg., 3-16-5 Higashi-Ueno, Taito-ku, Tokyo

IC Clinic Ikebukuro: 9F, Maeda Bldg., 2-15-3 Minami-Ikebukuro, Toshima-ku, Tokyo

IC Clinic Tokyo: 3F, Nihonbashi Front Bldg., 3-6-2 Nihonbashi, Chuo-ku, Tokyo

IC Clinic Omiya: B Block, 2F, Fukubi Medical, 1-60 Daimoncho, Omiya-ku, Saitama City, Saitama

Appointments are accepted via the link below. Please feel free to use it.

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