Finally went to the Doctor and was diagnosed as Eczema.
Hello,
I cannot confirm anything without examination but it can be redness caused due to irritation caused by touching of the hair and dermatitis skin due to rubbing of hair with the skin or sweat dermatitis. The best thing to consider is to prevent that portion of the body from sweating like by wearing light and cotton clothes, taking cool refreshing baths, maintaining the temperature in your homes and cars and avoiding strenuous activities. Also keep your hair tied when it is hot and sweaty.
If however dermatitis occurs, then please apply mild corticosteroid creams like dermacort or hydrocortisone or calamine lotion on the rashes.
I hope that helps. Take care and regards.