With the arguments for hydroxychloroquine as a treatment for COVID-19 patchy at best, here is one more reason why we should be careful when prescribing the antimalarial off-label.

Granted, this rare case did not occur in relation to coronavirus, but the potential for adverse reactions should still serve as a warning, wrote US doctors in the Journal of Medical Case Reports.

The 68-year-old woman presented to hospital with a painful and rapidly spreading rash.

Her medical history was significant for asthma, migraines and proximal muscle weakness. She was taking inhaled salbutamol, as needed, and had no known drug allergies.