Other skin lesions

Actinic keratoses are scaly thickening of the top layer of the skin in response to sunlight. They are pre-cancerous and may develop into squamous cell carcinoma if left untreated. Treatment is usually with liquid nitrogen, PDT or chemotherapy skin creams (such as Efudix or Aldara). 

Seborrhoeic keratoses are crumbly, fleshy or waxy appearing brown, black or pink growths on the skin. They are common and harmless but occasionally they may difficult to distinguish from other types of skin growths. They may be treated with surgical biopsy, shave, excision or cryotherapy depending on the specific characteristics of the lesion when examine by a specialist with a dermatoscope. 

Skin tags commonly occur around the neck, armpits and trunk. They are harmless but may be troublesome and become irritated at times. Sometimes they may appear similar to other lesions. 

Dermatofibromas are firm bumps which may appear like a scar or rubbery knot under the skin. They are harmless and can usually be diagnosed by a specialist using dermoscopy. It is not clear what causes dermatofibromas, however they often seem to develop after a minor injury to the skin (such as a mosquito bite, shaving cut or scratch).