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Overexposure to the sun can cause hard, scaly, or raised lesions on the skin. Precancerous lesions can often develop melanoma, basal cell carcinoma, and squamous cell carcinoma if left untreated.
Skin cancer will develop primarily on areas of sun-exposed skin such as the Face, lips, ears, neck, chest, arms, hands, and legs. Cancerous lesions take many forms. They can appear as waxy bumps, asymmetrical moles, hard red nodules, or scaly areas of skin. A doctor should be notified as soon as abnormal changes in your skin are noticed, in order to determine the cause.
Moles are growths on the skin that are typically brown or black in color. Instead of spreading throughout the skin, cells that make up a mole grow in a cluster and change color as they are exposed to the sun. They can appear alone or in groups, and by adults on average will have between 10 to 40 moles by age 30.
Most moles change slowly over time, and are not dangerous. However, if differences in shape, size, or color are noticed, a doctor should be contacted to evaluate the condition.
Sebaceous cysts arise from sebaceous glands, which secrete oils that lubricate skin and hair. They are generally round in shape, smooth to the touch; and made up of keratins, fibrous tissues, or fluids. Sebaceous cysts can be caused by an overproduction of testosterone, swollen hair follicles, or blocked sebaceous glands. Most cysts are not dangerous or harmful; however, they may require antibiotics or other medical attention for removal.