Hey.. Dr Satendra MD Dermatologist (MAMC, New Delhi) did SRship (AIIMS, New Delhi), currently practicing in Alambagh Lucknow this side..
Based on your history, and recent in onset, limited to extremities most likely Allergic etiology - may be Allergic Contact Dermatitis or Irritation contact Dermatitis or Urticaria.. this needs examination ( so do one visit to nearby dermatologist or online consultation on Practo)
Next Steps
Recently onset ACD/ICD lesions usually don’t need detailed investigation , precautions and some duration of treatment
Health Tips
Avoid contact with allergens- like detergents, caustic soaps, chemical contaminants in water etc..