Sarcoids. Sarcoids are a benign tumour that grow on the skin of susceptible horses. While they do not spread to any other organ in the horseâs body, they can certainly spread throughout the skin.arcoids. Sarcoids are a benign tumour that grow on the skin of susceptible horses. While they do not spread to any other organ in the horseâs body, they can certainly spread throughout the skin.
List pyrithione zinc topical side effects by likelihood and severity. The following side effects are associated with pyrithione zinc topical: Common side effects of pyrithione zinc topical: Skin IrritationSevere.
1 For best results, use pyrithione zinc shampoo at least 2 times per week or as directed by your doctor. Do not use more often than once daily.  If you miss a dose of pyrithione zinc shampoo, use the dose when you remember. Continue to use pyrithione zinc shampoo as directed by your doctor or the package labeling.