Thanks for the query
The swelling close to the spine needs examination to exactly know it's nature. There could be a possible link between these lump and tachycardia
., if the lump is infective one for example an abscess
. How ever, if the swelling is something else like a lipoma, neurofibroma
etc the link is unlikely and we may have to investigate him separately for both these conditions. My advice will be to get examined by a physician and get an ECG which will help us guide you better. Other causes of tachycardia/irregular heart rate
like thyroid dysfunction
should be kept in mind.