There is no evidence that African-Caribbean people get more in the way of skin problems during and after radiotherapy than people with lighter coloured skin.
With modern-day radiotherapy there is usually little in the way of skin damage for women having treatment after surgery for breast cancer. Towards the end of the course of treatment, and for 3 to 4 weeks afterwards the skin may become a little inflamed, feeling rather hot and a bit sore. This may lead to darkening of the skin. Very occasionally it can get more inflamed and actually break down, with loss of the outermost layer of skin, leaving the area pinkish-red and raw. This happens most often in women who have not had a mastectomy, and involves the skin in the fold of tissue under the breast, between the breast and the front of the chest. If it does happen it is very temporary, and the area does heal again completely afterwards.
The general advice for skin care is that although you can continue washing, showering and bathing during treatment you should avoid any talcum powder, perfumed soaps, deodorants and anti-perspirants on the skin in the area that is being treated. Most chemists and some supermarkets sell 'Simple' soap which is the best soap to use. You should gently pat the area dry with a soft towel and avoid any rubbing. You may find it helpful to dry the area being treated with a hair dryer on a cool setting. Gently massaging in a soothing cream, like E45 or aqueous cream, once or twice a day during your treatment can also help to keep the area comfortable. You can buy these creams from chemists and supermarkets.
Throughout your treatment you will be seen by your radiographers and if your skin is getting sore you should let them know. They will be able to give you advice on any other treatment or precautions that may be helpful.
