Q. Can the swelling and the red rash with itching on my back be due to bug bite?

Answered by
Dr. Basuki Nath Bhagat
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Jan 30, 2023

Hello doctor,

I am experiencing swelling, a large red rash on my back, and severe itching, which may be a bug bite. Kindly help.



Welcome to

I understand your concern.

I reviewed the picture (attachment removed to protect the patient's identity). There is an erythematous patch and swelling with erythema present. Are both the same lesion or present at a different area of the body? One of the common causes of such localized lesions is an allergic reaction to a bug bite. I would suggest the following:

  1. Apply steroid cream containing Hydrocortisone 1 percent twice a day.
  2. Take antihistamine medication containing Fexofenadine 120 mg or Fexofenadine and Montelukast combination once a day for five days.
  3. Change clothing, including bedsheets, and spray in the room for possible bugs or insects.
  4. Please visit the nearest healthcare facility if the itching is very severe.

Kindly revert for more queries.

Thank you.

Hello doctor,

Thank you for the reply.

I have been using Diphenhydramine HCl 2 percent spray, which has been helping. Thank you for confirming they are bug bites. I think they are spider bites. I will follow your instructions.



Welcome back to

Did you identify a spider in your living room? If yes, then it could be a spider bug bite. Also, I would suggest the following:

  1. Apply a cool compress over the bite for a few minutes each hour. Use a clean cloth dampened with water or filled with ice. This helps reduce pain and swelling.
  2. Make sure to spray insecticide in the room to avoid or prevent further bug bites.
  3. Watch for any pain, swelling, itching, or developing pus points in the upcoming days and follow up accordingly.

I hope this helps.

Thank you.

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