I would be pleased to answer your question .
From the description of the lesions they seem to be either a photosensitive dermatitis
or contact dermatitis
It can occur localised as in your case.
Here is what will help:
1. Clobetasol propionate
cream : apply over the affected twice a day for 14 days . Use a Good Sunscreen over the areas.
2. Tab Claritin
10 mg twice a day for 14 days, then once a day for 6-8 weeks. Initially the dose can be increased to 2 tablets taken twice a day if there is insufficient relief in itching.
Lastly keep the affected areas as well moisturized as possible with a moisturizer of your choice.
Also make sure you avoid direct sunexposure on the area affected.
Please feel free to ask if you have any queries.