Lesions can appear as nodules, abscesses, or ulcers, with skin color changes, and develop slowly (months). Rarely, the disease may progress to sepsis (infection of the bloodstream). What skin signs can be seen as a result of fish ingestion? Various syndromes that may affect the skin have been described after ingestion of fish or fish products. These include: Symptoms of hypervitaminosis A (vitamin A toxicity). Salmonella Raw fish can contain harmful bacteria, including salmonella, which can cause diarrhea, cramps, vomiting, headache, and fever.