It depends on the allergy. Obviously peanut Allergies are the most serious and then shellfish, and eggs are the next.
Symptoms may include-
These are not all going to occur when an allergic reaction occurs. It will usually be a variety of the ones above but if multiple are noticed you should defiantly seek a doctor for medical help.
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You may be having an allergic reaction to the ink because ink poisoning is impossible with tattoo ink (save for glow in the dark and UV reactive). All tattoo inks are inert and will not poison you. Allergic reactions however are fairly common.
if you're allergic to iodine, you'll probably have an allergic reaction
possible allergic reaction
There is always a risk of infection and allergic reaction
Unless you have some sort of allergic reaction to the temporary tattoo, there are no other adverse effects. Any allergic reaction however is highly unlikely.