I bet... those purplish welts are stretch marks. I know they look uber huge and garish but thats what happened to me. The pain comes from skin stretching too quickly over a short period of time. Don't be afraid the pain will go away but it can take like a year for the marks to start to fade.
That's how long its taken mine which were an angry red purple but are now fading to light purple and white. The were huge like 4-10 inches and made my abdomen look like a zebra. It freaked me out too. Also on my feet/ankles and calves and thighs I got smaller snakey light purple marks. The make the skin look distorted. One of the things that can help them go away quicker is vitamin e oil and lotion.
Mine were caused by edema, that's water retention caused by the kidneys not retaining protein which controls the water retention in your body. Do you have any bloating/swelling? Rapid weight gain over a short period of time? With me I gained 60 lbs in 3 weeks no joke. Thats why my skin stretched. I thought I'd channelled the spirit of the state puff marshmellow man although my family called me michelan man. I was horrified. With water pills, dietary changes, and some remission the marks stopped hurting and became soft distorted patches of flesh which in time started to fade. I've had flares but no new marks since that happened a year and a half ago. Oh also prednisone can cause these kind of marks too and at the time I was on 60 mg. That's alot! It's not an allergic reaction, just an unpleasant side effect.
When you see your specialist ask him if its a rash or strange stretch marks. Does it seem a rash or marks to you? Cause like I said vitamin e oil and lotion help loads. I didn't use them and my marks started to fade in a year. If I had used them earlier they prolly would have faded in 6 months or less.
Good luck! Hope this helped...
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