Our expert says:
Yes, it sounds like an allergic rash, and it certainly could be a reaction to a chemical(s) in substance (I'm not sure if you're saying it's paint or maybe a varnish?) There isn't a reliable home remedy, apart from avoiding the paint/varnish; you may well need prescription-strength cream or other medication, and treatment is specific depending on the type of rash.
You should really see a doctor about this if it isn't showing signs of improving, or at the very least a pharmacist. The paint/varnish may have worsened an underlying allergy/skin problem. There's also the possibility there are other causative factors.
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