Heal Wound 1 (Source)

You must also learn to use wound medpacks. Wounds are the slow-recovering black areas ("black rot") that appear in the red, green and blue bars after a character has experienced severe stress, such as getting beaten to a pulp by a giant monster or being cloned somewhere other than their bind point. As a medic you can heal the black wounds in the red and green bars, but only in medical centres, scout camps, or certain player-made buildings. You use medpacks in the same way as stims, except you select "heal wound" and the wound type from the patient's radial menu. You can double-click medpacks in your inventory, use the medpack's own radial menu, or use the /healwound command (can shorten to /healw) with the type of wound: /healwound action, or /healwound health. Using /healwound on its own does nothing unless you give it a wound type, so the default /healwound hotkey is useless. Perhaps make a set of macros (see the Ctrl-A screen) specifying the wound types, and drag them into your toolbar. Mind wounds (black area in the blue bar) are healed by entertainers. Wounds also repair themselves very slowly if a character rests in a medical centre, scout camp or player-made building.

Wounds also occur to the statistics not shown on the HAM bars. You can check for them on your own character by pressing Ctrl-C and looking on the "Personal" tab. For example, if somebody says they have 30 stamina wounds, you can heal them with a stamina wound medpack or use /tendwound stamina. At the time of writing, there is no visual representation of these stat wounds so patients have to tell you about them, but there may soon be a /diagnose command for medics to gauge stat wounds on others. As a medic, you can heal stat wounds in stamina, strength, constitution and quickness. Entertainers heal focus and willpower.