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Cantharis (spanish fly)
Cantharis is a specific remedy for bladder infections where there is a burning pain, before, during and even after urination. When a urine culture has been taken, Cantharis will often take the pain away and cure the whole process before the results even come back from the lab. The pains are violent, sharp and burning, and blood may even be seen in the urine .      

Cantharis is also the best remedy for second degree burns and sunburns with blister formation.