What specific localized tissue change warrants a physician call days later?

Spreading darkness or hardening tissue at the edges of the wound

Monitoring the wound site for several days post-injury is essential, even if initial pain relief was achieved through hot water immersion. While standard infection signs like generalized redness, swelling, or pus are important to observe, a distinct sign demanding further physician consultation is the development of localized tissue changes specifically at the edges of the original wound site. This includes observing any signs of spreading darkness or, alternatively, hardening of the tissue over the following week. These specific presentations may indicate a prolonged, localized tissue reaction occurring deep within the tissues as a result of residual venom components or the onset of deep, secondary complications that standard surface care cannot address.