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What causes itchy rashes on thighs and buttocks?

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Posted on Mon, 19 May 2014
Question: Just over a month ago I began to get itchy. A rash developed on the back of my thighs and buttocks. I thought nothing of it for a few days, because I've always had pretty sensitive skin. The itch got worse and the rash developed on my shoulders and around the armpits. The rash was generally just red but around the armpits little welt spots came and went. It started spreading down my arms. It appeared suddenly on the backs of my hands one day. I went to the doctor and she had me on 4 days of steroid pills, a pill for the itching and a cream. It helped but it never went away. It even surfaced on the insides of my ankles, which was new. I went back to the doctor and took another 10 days of steroids. It worked! But 2 days after the last steroid, the itching started again on the inside of my elbow and the backs of the knees. The rash is back, but different. Very dry, flaky red patches on the inner wrist and forearm, backs of the knees and the ankles. As I said before, I've always had sensitive skin and use soap and lotions and detergents catering to that. Nothing's changed. I experimented with leaving them out just to make sure I wasn't reacting to them, but to no avail. I even called the company to see if they changed recipes. Nope. About 6 weeks before the rash I switched birth control pills from lo estrin to lo lo estrin. In my first doctor visit she suggested going off the pill to see if it was maybe an allergic reaction, I decided to stay off it after the week was up it. I've been on the pill for 10 years. I read online that a dramatic change in hormones like that could lead to eczema type rashes. Thoughts?? Help! I scratch myself raw in my sleep.
doctor
Answered by Dr. Kalpana Pathak (2 hours later)
Brief Answer:
details below

Detailed Answer:
Hi,
Thanks for writing to us.
From the description, I can think of few differentials in your case like eczema, psoriasis, fungal infection, urticaria etc.
To confirm diagnosis and suggest appropriate treatment I would appreciate if you could upload pics of your concerned lesions. This can be done by clicking on upload report/image icon on right side of query page. You may also send your pics to YYYY@YYYY . Also mention Attn- Dr Kalpana Pathak in subject line
Hoping to hear from you soon
take care
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Follow up: Dr. Kalpana Pathak (10 hours later)
The rash was red and active on my wrists and arms the last few days but today is just flaky dry and slightly itchy (as seen below). The behind the knees have been consistent in both dryness around the edges and red in the creases. The red on the feet appeared today. I am most itchy at night and can see the rash most red after a warm shower. And as Ive said, it comes and goes in different parts. Hope this helps .
doctor
Answered by Dr. Kalpana Pathak (37 hours later)
Brief Answer:
it could be scabies with eczematisation

Detailed Answer:
Hi,
Thanks for writing to us.
I have seen the pictures attached. Lesions are red dry scaly ie look eczematous. If we go by the distribution and nocturnal itching, scabies seems to be the underlying cause.
In such cases i usually advise
1) TAblet ivermectin 12 mg single stat dose
2) Apply permethrin 5 % cream all over the body, neck downwards. Keep it overnight and bathe next morning.
3) permethrin has to be used only once. From next day onwards apply steroid cream over red itchy scaly areas twice in a day. Go with a potent steroid like clobetasol or halobetasol for faster relief
4) take cetrizine for controlling itch.

I hope this should help you out.
Take care
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Kalpana Pathak

Dermatologist

Practicing since :2006

Answered : 2014 Questions

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What causes itchy rashes on thighs and buttocks?

Brief Answer: details below Detailed Answer: Hi, Thanks for writing to us. From the description, I can think of few differentials in your case like eczema, psoriasis, fungal infection, urticaria etc. To confirm diagnosis and suggest appropriate treatment I would appreciate if you could upload pics of your concerned lesions. This can be done by clicking on upload report/image icon on right side of query page. You may also send your pics to YYYY@YYYY . Also mention Attn- Dr Kalpana Pathak in subject line Hoping to hear from you soon take care