As a dermatologist with over a decade of experience in the field, I have seen a variety of skin conditions and have a deep understanding of the warning signs of skin cancer. It's crucial to be aware of these signs to ensure early detection and treatment, which can significantly improve the prognosis.

Warning signs of skin cancer include:


1. Asymmetry: If one half of a mole or skin growth does not match the other half.

2. Border irregularity: The edges of a mole may be ragged, notched, or blurred.

3. Color changes: A mole may have varied colors from one area to another, such as shades of black, brown, or tan.

4. Diameter: Moles or growths larger than 6 millimeters (about the size of a pencil eraser) can be a sign of concern.

5. Evolving: Any change in size, shape, color, elevation, or another trait, or any new symptom (such as bleeding, itching, or crusting) should be evaluated.

It's also important to be aware of any new, unexplained skin changes, persistent sores that do not heal, or unusual growths on the skin.

Here's the translation in Chinese:

作为一名拥有十多年经验的皮肤科医生，我见过各种皮肤状况，对皮肤癌的警告信号有深入的了解。了解这些信号对于确保早期发现和治疗至关重要，这可以显著改善预后。

皮肤癌的警告信号包括：


1. 不对称性：如果一个痣或皮肤生长的一半与另一半不匹配。

2. 边缘不规则：痣的边缘可能是锯齿状的、有缺口的或模糊的。

3. 颜色变化：一个痣可能在一个区域到另一个区域有不同的颜色，如黑色、棕色或棕褐色的色调。

4. 直径：直径大于6毫米（大约一个铅笔擦大小）的痣或生长可能是一个担忧的信号。

5. 演变：任何大小、形状、颜色、隆起或其他特征的变化，或任何新的症状（如出血、瘙痒或结痂）都应该被评估。

同样重要的是要注意任何新的、无法解释的皮肤变化，持续不愈合的疮口，或皮肤上的异常生长。

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Other warning signs are:A sore that doesn't heal.Spread of pigment from the border of a spot into surrounding skin.Redness or a new swelling beyond the border of the mole.Change in sensation, such as itchiness, tenderness, or pain.More items...read more >>