Mucormycosis, also known as Zygomycosis or ‘Black fungus’ is a rare but serious fungal infection caused by mucormycetes, present naturally in the environment. The disease most commonly affects the immuno-compromised patients or patients with low immunity. Low immunity persons are those who have recently recovered from covid, patients suffering from debilitating diseases such as diabetes or cancer, patients severely hospitalised for a long time or those who have been taking steroids for a long time. Due to these conditions, they suffer from low immunity and develop a disease called Mucormycosis or black fungus. Black fungus attacks the blood vessels of the body, which leads to less blood supply in different organs such as eyes, nose, teeth, brain, lower jaw, lungs. This leads to loss of vision, loosening of teeth, one-sided cheek pain, swelling, blackish discoloration of nose, difficulty in breathing. Two homoeopathic medicines, Arsenicum album 200 (twice daily for 5 days) and Five phos 6x (twice daily for one month) are best homoeopathic medicines to prevent Mucormycosis.