My Dear
Welcome to this website!
I have noted your details and concerns.
It seems that you have photo sensitivity, a condition in which the skin ofa person reacts angrily to the UV rays of the sunlight.
It is good that you discontinued the sun exposure activity and saved a difficult situation.
For your current problem, I would have prescribed the following to my patients with similar picture:
1 To use a mild
steroid cream like
Hydrocortisone.
2 To wash the area with plain water several times a day
3 To refrain from use of chemicals. deodorants or cosmetics on the area
4 To use
cold cream or moisturizer at night.
5 To keep the affected part covered with suitable clothing.
I am sure you will be careful now and have the most from my suggestions.
You will be well soon, but do take anti allergic for itching, if it develops at all.
Best wishes