Inflammatory acne includes red, swollen, sometimes painful lesions — papules, pustules, and nodules — rather than just clogged pores. It typically needs more active treatment than comedonal acne to keep scarring risk down. This is the stage where dermatologist involvement often becomes more important.

Isotretinoin is a strong oral medicine reserved for severe or treatment-resistant acne. It works by significantly reducing oil production and shrinking the sebaceous glands themselves. Because of its potency, it's used under close medical supervision rather than as a first-line option.

An IL-23 inhibitor works by blocking interleukin-23, another immune messenger involved in triggering psoriasis flare-ups. One of its practical advantages is that it's often given as an infrequent injection, sometimes just every few months. This makes it appealing for people who want fewer treatment visits.

An IL-17 inhibitor targets interleukin-17, an immune signal that plays a major role in fuelling psoriasis inflammation. Blocking it can lead to substantial skin clearing for many people. It reflects how far treatment has moved toward pinpointing very specific immune targets.

Inverse psoriasis settles into the body's folds — armpits, groin, under the breasts — where friction and moisture are constant. Unlike plaque psoriasis, it tends to look smooth and shiny rather than scaly. This is a good reminder that psoriasis doesn't always look the same in every location.

Idiopathic simply means unknown cause, so idiopathic urticaria refers to hives that appear without any identifiable trigger, even after testing. This is actually a common outcome in chronic cases. It's reassuring to know that treatment can still work well even when the cause stays a mystery.

Immunoglobulin Test means a blood test to check if your immune system has enough "soldiers" to fight infections. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.

Idiopathic means a term doctors use when they cannot find the original cause of your bronchiectasis. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.

Inhaled Corticosteroids means "puffers" that deliver steroids to the lungs to reduce swelling/inflammation. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.

Infiltrate means a "shadow" or substance (like fluid or pus) seen on a lung x-ray. This term describes an important change in the lungs or airways. Understanding it can help explain symptoms such as breathlessness, mucus build-up, or repeated infections. It also supports doctors in monitoring the condition and adjusting treatment.