Hypnos will not be affected, which is actually disappointing because he likes flowers (albeit not growing from his skin but he supposes there are worse things.)
Ammut, however, will have blue cornflowers blooming between her knuckles, along her collarbones, around her neck, and down her spine. The more concentrated/focused she is on her task the more the flowers will bloom and grow from the room around her, which is bound to be hellish while she takes her finals. So much unhappiness.