betta fish has a huge white bump and lost his tail. what do i do?

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i have a betta fish and he has a huge white bump/lump on his right side. he was sick about a month ago from the water being too cold so i bought a heater for his tank and he was cured (got his color back and started swimming around again), however this huge white bump started growing on his side. also, he lost his tail while he was sick. i clean the tank once a week so he does have clean water and the temp of the tank is kept around 75 degrees.

is it possible to grow his tail back and get rid of the lump???

someone please help me. i love my fish very much and i want him to be healthy.
 
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