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Dear Fr7! Spider on the abdomen and ribcage , indicate a possible LIVER problem and not spleen(Congestion of portal vein).Best possibility is a shrinking liver due to any reason like alcohol intake or viral hepatitis.I will suggest you to investigate your liver by doing following tests , HCV, HBsAg, LFT's and an abdominal ultrasound.Hope i have answered your question.
A right sided heart failure could cause congestion of liver too.At any case you must investigate your liver because the meds you are using can cause liver damage too.And do a chest x-ray to see your heart too.