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Red color is very useful for such swelling. Apply red color ray or keep a red water pillow to the swelling point.
Khwaja Shamsuddin Azeemi
وَمَاذَرَالَکُم فِی
الْاَرْضِ مُخْتَلِفًا اَلْوَانُه اِنَّ فِیْ ذٰلِکَ لَآيةً لِقَومِ يَّذَّکَّرُوْن
"And whatever He has spread for you on the earth of varying colors—surely in that is a sign for a people who reflect."
Surah An-Nahl (16:13)