Moles and Red Spots: When to Seek Dermatological Advice

Moles, red moles

I am 26 years old and have a mole on my calf that I've had since childhood.
It was originally small, but now it has grown to about one centimeter.
I would like to know if moles can change as I grow older or gain weight, and if they could potentially develop into serious issues.
Recently, I also noticed two red spots on my arm, about the size of a pinprick, bright red in color, and flat to the touch.
I'm unsure whether these are petechiae or red moles.
How can I differentiate between the two?

liù, 20~29 year old female. Ask Date: 2022/12/22

Dr. Wu Yuxin reply Dermatology

As one grows older, moles typically increase in size.
Whether they are bleeding points or vascular lesions needs to be observed over a period of time to determine.

Reply Date: 2022/12/22

More Info

When it comes to understanding moles and red spots on the skin, it's essential to recognize that changes in these skin features can be indicative of various conditions, some benign and others potentially serious. Your concerns about the mole on your calf and the new red spots on your arm are valid, and seeking dermatological advice is a prudent step.

Firstly, regarding the mole you have had since childhood, it is not uncommon for moles to change in size, shape, or color as a person ages. Factors such as weight gain, hormonal changes, and sun exposure can influence the appearance of moles. However, significant changes in a mole, especially if it becomes larger than 6mm, has irregular borders, or exhibits multiple colors, can be a warning sign for melanoma, a type of skin cancer. The ABCDE rule is a helpful guideline for assessing moles:
- Asymmetry: One half of the mole does not match the other.

- Border: The edges are irregular, ragged, or blurred.

- Color: The color is not uniform and may include shades of brown, black, or even red, white, or blue.

- Diameter: The mole is larger than 6mm (about the size of a pencil eraser).

- Evolving: The mole is changing in size, shape, or color.

If your mole is growing or changing in any of these ways, it is advisable to consult a dermatologist for a thorough evaluation.

As for the two red spots on your arm, they could be a variety of things. If they are small, flat, and bright red, they might be cherry angiomas, which are benign growths of small blood vessels. These are common and usually harmless, but if they appear suddenly or change in appearance, it’s worth having them checked. Alternatively, if they are raised or have irregular borders, they could be something else entirely, such as a dermatological condition or even a sign of bleeding under the skin (petechiae).

To differentiate between a cherry angioma and a petechial spot, consider the following:
- Cherry Angiomas: These are typically smooth, round, and can vary in size. They are often bright red and may appear on the trunk, arms, and legs. They are harmless and usually do not require treatment unless for cosmetic reasons.

- Petechiae: These are tiny red or purple spots that appear when small blood vessels bleed into the skin. They do not blanch (turn white) when pressed and can be a sign of various conditions, including infections, blood disorders, or physical trauma.

In any case, if you notice new growths on your skin or changes in existing moles, it is crucial to seek the advice of a dermatologist. They can perform a physical examination and may recommend a biopsy if there is any suspicion of malignancy. Regular skin checks, especially if you have a history of skin issues or a family history of skin cancer, are essential for early detection and treatment of potential problems.

In summary, while changes in moles and the appearance of new spots can be common, they should not be ignored, especially if they exhibit concerning characteristics. Consulting with a dermatologist will provide you with the best course of action and peace of mind regarding your skin health.

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