welcome to HCM!
Itching can be due to contact dermatitis
vascular eczema, stasis dermatitis or scabies .
For these rashes, do not use any cosmetic products at the sites. You can apply some calamine
lotion at the rash as it will help in soothing the skin. Also take some antihistaminic and apply a mild steroid
cream on the itchy bumps. Also keep the area well moisturized.
If the symptoms persist then get an evaluation done from a dermatologist
I sincerely hope that helps. Take care !