Hello.
Thank you for asking at HCM.
I went through your history and would like to make suggestions for you as follows:
1. As they occur most often underneath clothes, I would agree they could be due to clothes themselves or laundry powder used for clothes. Please try to observe whether they occur with particular clothes/particular type of clothes for example, woolen clothes.
2. Were I treating you, I would suggest you to take an antihistamine like
levocetirizine or
fexofenadine for your symptoms.
3. I would also suggest you to apply lotion like
calamine over the itchy areas. Please don't scratch itchy areas as scratching can worsen itching.
4. I would also suggest you to avoid wearing tight-fitting, woolen clothes. I usually suggest my such patients loose-fitting, cotton clothes.
5. Please avoid activities causing
excessive sweating and avoid too hot or too spicy food as they can worsen symptoms.
Hope above suggestions will be helpful to you.
Should you have any further query, please feel free to ask at HCM.
Wish you the best of the health.
Thank you & Regards.