Unusual skin lesion after some unusual behavior

[KingKong99]

Hello,
   I am concerned about the cause of some things that popped up on my thighs a few months ago.  First there was a painless bruise on the front of my thigh, then there was I red colored marking on the inside of my left thigh.  They both went away in a matter of days, and they were both painless.  The thing that is bothering me is that they both seemed to be without an obvious cause.  http://i.imgur.com/XYATd.jpg http://i.imgur.com/3I3hg.jpg http://i.imgur.com/Vh7Ds.jpg.  They seemed to appear out of nowhere, and were completely painless.  They went away on there own and turn and greenish yellow color before fading away completely, kind of like a bruise does.  I live in florida and I am very active on my bike and at the gym, and I am wondering if the red marks look like vasculitus or golfers rash or something more serious.

Could this be a sign of an STD?  I had unprotected sex about a year ago.  Is this the type of spot that comes from a problem with my immune system?  Liver problems?  Am I overreacting?

What could this be?

[Bharat Chawda, MD]

Dear KingKong99,

Thank you for posting the query.

I have carefully gone through all the details and images links that you have provided. I do not think your lesions are related to a STD or a problem with your immune system. It does not appear to be related to a liver problem either. Based on the available information, I am of the opinion that it might be a Fungal infection or a bruise following trauma or friction.

I would be in a better position to tell whether it could be vasculitis or not, if you can answer these questions:

1) Did the lesion blanch on pressure i.e on putting firm pressure did the lesion lose its redness?
2) Was there any itching on the lesion?
3) Was the lesion bilateral i.e on both thighs?

Do get back to me with these details so that I can help you better.

Hope that this information helps and hope that you will get better soon.

Thank you for using MedHelp's "Ask an Expert" Service, where we feature some of world's renowned medical experts in their fields. Millions have benefitted from our service to get personalized advice for them and for their loved ones.

Best Regards,
Dr. Bharat Chawda.

[Bharat Chawda, MD]

Dear KingKong99,

Thanks for writing back.

The appearance of the lesions on the both sides does not hold much relevance here as I suspect it to be due to either local extravasations (leak) of blood from the blood vessels or transient nonspecific vasculitis leading to increased permeability of the blood vessel wall.

However I would recommend you to get some bleeding parameters tested such as clotting time, bleeding time, PT and APtt, which can give a clue to the cause of the lesions. Painless fading lesions such as these are often seen in bleeding disorders, but they rarely occur at one place. Generalized presentation is much more common.

Amongst the causes that you mentioned in your previous post I would rule out STDs and immune related issues in here. Sometimes underlying liver pathology can affect clotting mechanism producing such lesions.

Best Regards
Dr. Bharat Chawda.

[KingKong99]

Hello Bharat,
   I think I remember getting a similar painless bruise on a similar spot on the opposite thigh a few weeks after the first one.  I could be imagining that though.  But this series of reddish marks was only on my inner left thigh http://i.imgur.com/XYATd.jpg.

I dont think they blanched but again they are gone and have not reappeared since they appeared that one time months ago.  

Zero itching.