3 Answers

Symptoms of Skin Cancer

A small lump (spot or mole) that is shiny, waxy, pale in color, and smooth in texture.
A red lump (spot or mole) that is firm
A sore or spot that bleeds or become crusty. Also look for sores that don't heal.
Rough and scaly patches on the skin.
Flat scaly areas of the skin that are red or brown.
Any new growth that is suspicious 

Source http://cancer.about.com/od/skincancermelanoma/a/skinsymptoms.htm

Actinic keratosis appears as a scaly or crusty lesion, most often on the scamp, face, ears, lips, back of hands and forearms, shoulders, or neck—those areas most frequently exposed to the sun. They are sometimes so small that they are found by touch and not by sight. They may feel like a small patch of sandpaper on your skin.

Basal Cell Carcinoma

Basal cell carcinoma often appears as a waxy bump, usually in the areas of the body most often exposed to the sun’s ultraviolet radiation.

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Squamous Cell Carcinoma

Squamous cell carcinomas most commonly occur on the more sun-exposed body parts, but can also appear on the inside of your mouth or on your genitals. The tumors caused by squamous cell carcinoma can take a variety of forms, including:

a firm, red nodulea flat lesion with a scaly crustan ulcer in the moutha red, raised patch on the anus or genitals

Squamous cell carcinoma is also known to cause intense itching, which only further irritates and inflames the skin. Scratching the skin can lead to infections that need to be treated with antibiotics.

Melanoma

Melanoma, the deadliest form of skin cancer, most often develops on the lower legs in women and on the chest, back, head, and neck in men. Here are some characteristics that may indicate that a mole, freckle, or spot is a sign of melanoma:

Asymmetrical/Irregular Borders

If the edges of a mole or freckle are irregular rather than fairly even all around, it could signal a cancerous change.

Change in Color

Color variation within a mole or freckle can be another telltale sign. Keep an eye out for these changes in color or appearance:

The most common warning sign of skin cancer is a change in the appearance of the skin, such as a new growth or a sore that will not heal.

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