Welcome and thanks for posting your query to HealthcareMagic.
As per your query you have skin darkening at the chin with itching.
It appears that you have got mild sun burn or sensitization over the affected area. Do not apply any lightening cream or any other cosmetic cream over the affected area as it may irritate the skin more.
You can apply Fluticasone
cream or Mometasone
over the affected area for a maximum of 7 days. If the redness
and itching still persist after 7 days then can meet your dermatologist
for the best treatment.
I hope these information's will help you. If you have further queries I will be happy to help.
"Wish you good glowing skin"
Dr Sanjay Kumar Kanodia
MD (Dermatology and Sexually Transmitted Diseases)