It may occur in pre-existing moles.Pay attention in size,shape and colour changes,inflammation,crusting or bleeding,asymetry,irregular colour,elevation,irregular border.
Neighbouring "satellite" lesions may occur.If smooth,well-demarcated and regular,it is unlikly to be a melanoma.
Squamous cell cancer
This usually presents as an ulcerated lesion,with hard,raised edges.They may be found in the lips of smokers or in long standing garvitational leg ulcers.Metastases are rare,but local destruction may be extensive.As treatment is recommanded the total excision.
The condition may be confused with keratoacanthoma-a fast growing benign,self limiting,papule plugged with keratin.
Basal cell carcinoma
Typically ,pearly nodule with rolled,telangiectatic edge uaually on the face.Metastases are very rare.It is locally destructive epithelioma (if left untreated).Lesions on truck may appearas red scaly plaques with rased smooth edge.The cause of basal cell carcinoma is UV exposure.
As treatment is recommanded excision and radiotherapy can be used for large lesions in the elderly.
Bowen's disease
Slow growth red scaly plaque,full thickness,dyspalsia.
Actinic keratoses appear in sun exposure skin as crumbly,yellow-white crusts.Malignant changes may occur.
Secondary carcinoma
The most common metastases to skin are from breast,kidney and lungs.The lesion is usually a firm nodule,most often in the scalp.
Mycasis fungoides
Is a lymphoma which is usually confined to skin.It causes itchy,red plaques.
Leukoplakia
This appears as white patches which may fissure on oral or genital mucosa (where it may itch).
Syphilis
Any genital ulcer is syphilis until proved otherwise.Secondary syphilis:popular rush including,unusually in the palms.
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