Welcome to HCM,
As this problem of recent origin this might be due to some insect bite giving rise to local itching and knots.
Due to allergy
there is itching and some swelling.
You can take benadryl
syrup or tablet once or twice a day.
Or you may take Cetrizine
or Levo cetrizine as and when required.
Apply some anti-allergic lotion or some moisturizing lotion.
Ok and bye.