Hi,
Thanks for the question. It does sound like you may have developed an allergic reaction to the plaster, resulting in the rash. This is likely to be due to an allergic contact dermatitis to the plaster.
It is great to know that the rash has resolved. However, the skin inflammation caused by the allergy has resulted in pigmentation of the skin, also known as post inflammatory hyperpigmentation.
The good news is that this pigmentation will usually fade with time, although it may take weeks or months to fully disappear. Sometimes, a lightening cream such as hydroquinone may be prescribed to help speed up the lightening process. Overall the likelihood of this clearing up is very good.
