Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care for heavy bleeding that will not stop, fainting, severe trouble breathing, chest pain or signs of a serious allergic reaction such as swelling of the face or throat.
Contact your healthcare team promptly for increasing redness, warmth, swelling or pain; pus-like drainage; fever; wound edges opening; or a graft or flap becoming dark, pale or unusually cold.
Contact the team urgently if bleeding continues despite firm, uninterrupted pressure for the recommended time.
And for anyone, someone who:
Questions about dressings, stitches, expected bruising or routine wound checks can usually wait for normal clinic hours unless symptoms are worsening.
The article also says
Follow the facility’s instructions for bleeding.
Every sign above is quoted from the sofidex article on Mohs micrographic surgery. If you are not sure, err upward — it is always reasonable to be checked.