What is a rash in the shape of a circle on your skin?

Sounds like it could be ring worm. I'd have it checked by a doctor to know for sure. It could just be an irritation that happens to be in a circle.

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It is probably a ringworm; however, you should see your doctor and get some medication.  

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Don't waste your money on a doctor. Just go to your local pharmacy and ask him what he thinks it is and and see if he can give you something over the counter for it. Most Pharmacist know just as much as doctors.  

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If the center is clear andit is a ring shape and has bad itching it probably is ringworm The old and proven remedy is to soak a cottonball in Clorox Bleach. Thoughroly soak the area let dry leave it on a while Tjis does burn but 1 time should be enough to smother the worm  

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Ringworm is not a worm. It is a fungal infection slightly under the skin. Do not use bleach on your body, its for your clothes or cleaning up disgusting things on floors or counters. Go buy some antifungal over the counter medication. if problem presists, consult your doctor.  

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as a retired cosmetologist & instructor, & mother of 2 sets of now adult twins and a 13 yr old as well, I think I might be able to help on the ringworm thing. It is a fungal infection, but from my experience and I have had plenty of it, over the counter medicines don't work, especially if it has already developed the full ring, for every over the counter med you continue to try and every home remedy you try, it will continue to get larger and larger, and as it does, it does damage to the skin tissue, nails (if involved), and especially any hair folicles. The only true treatment I have ever found successful, included antibiotic creams with INTERNAL Prescription Medication/antibiotics at the same time. (Depending on it's severity, and strain, it can in some cases require medications that use poisons in which cases the blood / medication levels of the patient have to be monitored closely. Getting a correct diagnosis and correct treatment is best done through a dermatologist not a regular MD. I have had one of my children end up with minor permanent damage to hair follicles, and hair no longer grows where the infection occurred, thankfully it was an underneath area, don't wait to seek out a doctor to find out for sure the sooner it's treated, the less complicated the treatment needs to be- if it's treated both internally and ex-ternally at the same time. good luck.
I agree with the above statement except treating it with an antibiotic. Antibiotics are only for bacteria. Since it was stated that ringworm is caused by a fungus, antibiotics may further worsen the problem. However, one fungus is treated by antibiotics, Pneumocystis jiroveci, but that is only seen in immunocompromised people such as AIDS patients. It should be treated internally (terbinafine or itraconazole) and externally (terbinafine 1% cream - Lamisil). Do not suck on a tube of Lamisil for internal treatment. It's not the same thing. Since you need a prescription for the internal medication, you might as well go to the doctor anyway
Most of the above answers say ringworm, but i had this red patch on the inside of my arm. in fact, i get it every spring. it was nothing. just some sort of irration of the skin.

My mom has this rash on her arm by her elbow.. its bumps in the shape of a circle..not a completely round circle..but almost. what is it????  

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If it's in the shape of a circle, not raised, white if your tan and red if your not then it may not be ringworm. I am speaking fom my own personal experience, because I've never had ringworm. I went to my dermitologist for this one. But the skin on my chest leading up to my neck is very sensitive and there is a fungus that lives on just about everyone and is normally introduced through family members (the close proximity). I have several perfectly round, sometimes itchy, spots. My doctor gave me a cream that's usually used for such fugial things as say ringworm. It's called 'Oxistat', I am to apply it once a day for three weeks or so and can stop when i see that the spots are gone. However, because my skin is so senitive in this area they will most likely reappear sometime in the future. Normally from sweat or over exposure to the sun. Anyway, just incase anyone was wondering if it could be anything besides ringworm, here's your answer.

Circle with red circle inside? if so get checked for Lyme desease.