Thanks for your query
Your friend seems to have developed an allergic dermatitis
over the wrist.
Find out if there is history of wearing any new watch or any new jewellery over the hands.
Many times metals, plastic as well as rubber items can cause such reaction.
Avoid applying any creams or oils over the affected areas.
Use a topical steroid
cream over the area twice a day.
Can take oral antihistamines if there is any irritation.
Hope it helps
Dr geetika paul