£2.95 – Salactol is a collodian wart paint for treating warts, verrucas, corns and calluses. – Warts and verrucas are small excessive growths of skin caused by a type of virus. Warts often occur on the fingers, or on the back of the hands. You can recognise the common wart by the rough “cauliflower-like” appearance of the surface. Verrucas occur only on the sole of the foot. They can be painful, and often look like a small white ring of skin with a black dot in the centre.