What would the rash look like if you had an allergic reaction to brometane?

Varies: If you think you having an allergic reaction to any drug contact the doctor who prescribed the drug if you can stop the drug .Discuss whether you can use another drug which will not give you possible reaction. If the drug is essential it can be reintroduced after the rash resolves only under direct medical supervision. It is preferable to avoid drugs which cause allergic reactions.

Brometane: That depends. Where did you get the reaction? How long after using the brometane? Rashes due to allergic reactions can come in many shapes, sizes, forms, colors, etc.