Anyone fancy diagnosing this thing on my child's skin?

[Mysterycircle]

Hopefully picture has attached.

This circle appeared on my child's torso on Tuesday. Well first noticed that day.
As you can see it's very neat, it's not raised, it doesn't itch, child is not unwell.
The pharmacist looked at it and thinks it unlikely to be ringworm, and suggested seeing the GP as he had no idea.
Trying to get an appointment is proving a nightmare, so while I wait I thought I'd ask if anyone else has come across such a mark

Ringworm or discoid eczema maybe.

Has he been poked with a pole?

Possibly ringworm - have you noticed the circle getting slowly bigger with skin peeling off?

Jabbed with a cylindrical object?
What age is he?

I think it looks like an injury too, the circle looks to perfect to be a rash.
Some sort of pole or has he leaned on a hot pipe or something?

I thought he might have been poked or slept on something which left an imprint but he says no to both

He's mid teens

A bite from an insect. Looks a bit like a tick bite. An allergy of some kind from an insect.

vacuum cleaner love bite? I don't think he's being completely honest with you OP.

Something in his pocket that has caused a reaction? Something on his phone?

It's the neatness of it which is baffling me. I agree it looks more like an injury than a rash.

He is sure nothing has caused it but then teens get up to all sorts of daft things so who knows

@username12345T

A bite from an insect. Looks a bit like a tick bite. An allergy of some kind from an insect.

Yes it could be. Draw around it with a pen and see if it gets bigger.

It does look like ring worm to me, although admittedly it is normally slightly raised and itchy. Do you have pets or has he been in contact with any animals, particularly livestock?

Has he tried to do a home made tattoo?

Wouldn't there be a mark in the centre if it was from an insect bite?
I'll draw around it although It doesn't appear to have got any bigger from Tuesday

I say bung some Caneston hydrocortisone or athletes foot cream on it and if it’s ringworm it will start fading pretty quickly.

Lyme disease with a non-typical rash? They present in lots of different ways?

Has he stuck one of those window suckers on himself? One of mine had a "rash" that looked similar that turned out to be that.

Also take piriton tablet.

I think injury too.
The same thickness all round and round shape is all too perfect for a rash surely!
Please update even if it's 15 years later confessing as an adult

When his arm is down, does it look less like an oval? A sucker thing is a good call.

If you are having trouble getting into the GP, I would put an anti-fungal cream on it. For all the mystery, it really is probably just ringworm.

The circle is so neat I thought you'd added it on to highlight a mark! Echo PP as to it being ringworm or tick bite, although I thought the classic bullseye had another red mark in the centre, and don't look so perfectly circular.

If you Google pix of ringworm, there really are some perfect circles in the examples there. Nature is fascinating!

Waiting for the update ...