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Some people claim using banana peels and raw eggs resulted in improvement of welts and bruises. If your welt is not healing in response to other treatments, try rubbing the peel of a ripe banana on your welt or breaking a raw egg over the wound. Some anecdotal evidence indicates increasing your intake of vitamin K and C can help heal a welt. This may be because both vitamins have a positive effect on the immune system.  Stop by your local pharmacy and see if they carry Vitamin K creams. Ask for instructions on how to apply. Some people find Vitamin K cuts down on healing time. Vitamin C is found in foods like citrus fruits, pineapples, and apples. Upping your intake of natural Vitamin C may have some effect on the healing time of a welt. You can buy Epsom salt at most drug stores and supermarkets. Run a warm bath and add a cup or so of Epsom salt. Let it dissolve and soak for about 20 minutes. Adding essential oils to the bath may also be beneficial. Try lavender or geranium.
Try banana peels or raw eggs. Use Vitamin K and C. Take a bath with Epsom salt.