Research Topic: hypersensitivity reactions

Chronic Urticaria Suspected to be Caused by a 13.5 mg Levonorgestrel Intrauterine Device (Skyla®)

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A woman developed a chronic hive-like rash that lasted for two years after having a hormone-releasing intrauterine device (Skyla®) implanted. Extensive medical testing ruled out common causes like vitamin D deficiency and allergies. When the device was removed, the rash gradually disappeared completely over two years. This case suggests that the progesterone released from the device may have triggered an allergic reaction in this particular patient.

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Chronic cavitary pulmonary histoplasmosis treated with isavuconazole after a hypersensitivity reaction to itraconazole

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A 68-year-old patient with a serious lung infection caused by Histoplasma fungus initially developed an allergic skin reaction to the standard medication itraconazole. Unable to use the typical treatment, doctors switched him to a newer antifungal drug called isavuconazole using a carefully controlled graded dose approach. The patient successfully tolerated the new medication and achieved complete resolution of his infection with sustained improvement, suggesting isavuconazole could be a viable alternative for similar patients.

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