During consultations Dr Johnston is often asked about the Cryosurgery treatment and Dermoscopy service he provides:
"Cryosurgery is used to treat a variety of both non-cancerous and cancerous skin conditions. The most common method of freezing lesions is by spraying super-cooled liquid nitrogen onto the area of skin to be treated. It is it used for harmless but troublesome skin lesions such as warts and skin tags. The most important use is in the treatment of sun damaged tissue. Early cryosurgery treatment of lesions due to sun damage can save more extensive, disfiguring surgery later on. Some people, particularly children, find the application of the nitrogen painful both during the procedure and for a day afterwards. The treated area usually heals within 14 days.
Dermoscopy is used by Consultant Dermatologists to help in the diagnosis of suspicious moles and skin cancers. The dermoscope is an instrument that effectively makes the outer layers of the skin transparent. This allows a Dermatologist to visualise structures in the skin which are invisible to the naked eye. Dermoscopy is painless. Sometimes antiseptic gel is applied to the skin to aid viewing. An experienced Consultant Dermatologist can assess all the moles on a patient’s skin in a matter of minutes. Dermoscopy does not treat the mole. Some patients may need to proceed to a skin biopsy or full removal of a mole if skin cancer is suspected."