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Flat, red rash on left forearm, prickly and achy. What could be it?

On two seperate occasions in the last 4-6 weeks I have had what I can only describe as an flat, red rash appear on my left forearm (in the morning after I've slept) that looks like a burn/love bite/bruise. It's approx' 8 inches long and about 2 inches wide and at the top looks like a spike. It looks like tiny red pin pricks and was lighter in colour this time but a bright red before. The last one went away within about 4-5 days but I feel alright within myself. I went to the doctor the first time who was baffled, I mentioned blood disorders such as leaukemia which he dismissed saying he'd never seen that with that. My arm feels slightly prickly and achey? I often sleep on my arm and did wake up with numbness due to laying on it last night. I am very worried for fear it is serious.
Please help, thanks in advance!
Asked On : Tue, 16 Apr 2013
Answers:  1 Views:  107
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Dermatologist 's  Response
Hi princess,
Thanks for writing in.
The condition can be tinea mannum,contact dermatitis ,insect bite etc.
You can apply Aloe vera lotion twice daily for 15 days.
A topical corticosteroid like hydrocortisone cream can also be applied once a day for week.
The condition should subside within a week.
If it persists then a skin biopsy may be needed for diagnosis.
Hope this helps.
Answered: Tue, 16 Apr 2013
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