Hydrocortisone

Hydrocortisone is the reference mild-potency topical corticosteroid. Other steroids are rated as multiples of its strength: moderate is 2–25×, potent 100–150× and very potent up to 600× (DermNet). In the UK all strengths in common use (0.1%, 0.5%, 1% and 2.5%) are classed as mild. NHS formulary guidance favours 1%; 2.5% and 0.5% ointment are non-formulary and much more expensive (Norfolk & Waveney formulary). In the US, hydrocortisone 1–2.5% is group VII, the “least potent” class (AFP 2009). Parents should not confuse it with hydrocortisone 17-butyrate (Locoid). Despite the shared name, that is a moderate-potency steroid in the UK/NZ scheme (DermNet).

Hydrocortisone [part-of] Topical Corticosteroids Hydrocortisone [treats] Atopic Dermatitis

Where it is used in toddlers. NICE CG57 recommends mild potency for mild eczema and for the face and neck in children. Moderate potency is allowed on the face only for 3–5 days in severe flares. US guidance (AFP 2009) lists low-potency agents for the face, eyelids, skin folds and nappy (diaper) dermatitis, so hydrocortisone is the usual first steroid for Nappy Rash-area eczema. Under a nappy, the skin is effectively occluded and absorbs more steroid. This is why even mild steroid in that area should be used in short courses, dosed by Fingertip Unit.

Hydrocortisone [treats] Nappy Rash NICE CG57 [supports] Hydrocortisone Fingertip Unit [relates] Hydrocortisone

Over-the-counter status. In the UK, hydrocortisone 1% can be bought in pharmacies. The NHS says children under 10 should only use it if advised by a doctor or pharmacist. OTC use should not go beyond 7 days without advice, and it should not go on the face or genitals without advice. A toddler therefore needs a prescription or clinician advice, and prescribed hydrocortisone can be used on the face and nappy area. In the US, the FDA OTC monograph M017 allows hydrocortisone 0.25–1% without prescription. Its required label says “children under 2 years of age: do not use, consult a doctor”, and also “do not use for the treatment of diaper rash”. Stronger 2.5% is prescription-only.

MHRA [regulates] Hydrocortisone FDA [regulates] Hydrocortisone

Conflict: [FDA OTC Monograph M017, 2023] requires OTC hydrocortisone labels to say “do not use for the treatment of diaper rash”, and the [NHS, n.d.] OTC advice says do not use on the face or genitals without advice. [NICE CG57, 2007/2023] and [AFP Ference & Last, 2009] recommend mild/low-potency steroid specifically for the child’s face, neck and nappy area. These are different settings (self-treatment versus clinician-directed), but parents read both. Unresolved — add to open_questions.

Safety and evidence. Mild-potency TCS has the strongest safety record for toddlers. The Cochrane review (2022) and the Axon umbrella review (2021) found Skin Atrophy cases mostly with potent or very potent steroids. DermNet says systemic effects need more than about 500 g of hydrocortisone a week. Side effects listed by the NHS (thinning, stretch marks, colour change, small red vessels) are rare at OTC strength used as directed. Hydrocortisone is also one of the steroids found undeclared in Adulterated Herbal Creams. A “natural” cream that works dramatically quickly may in fact contain a steroid.

Hydrocortisone [relates] Skin Atrophy Hydrocortisone [part-of] Adulterated Herbal Creams

Undeclared steroid in "natural" creams

Hydrocortisone and stronger steroids have been found undeclared in unlabelled “herbal” eczema creams (Ramsay ADC 2003). Using such creams unsupervised on a toddler’s face or nappy area removes the potency and duration limits that make hydrocortisone safe.

What parents report (evidence: anecdotal). Hydrocortisone is the steroid parents mention most, and often call too weak. One parent wrote: “I’ve been using 2.5% corticosteroid on her. But the eczema doesn’t seem to be going away”, and another replied “2.5% hydrocortisone is not a strong steroid” (r/ScienceBasedParenting). UK parents describe it clearing skin, which then “comes back even worse” once stopped, and some read this as withdrawal (Mumsnet). One US parent filed an FDA report after a flare 2 days after a 2-week course (r/eczema). See Parent Experiences and Topical Steroid Withdrawal.

Hydrocortisone [relates] Parent Experiences

Connections

• Topical Corticosteroids — mild-potency member; first choice on face/nappy area, source: NICE CG57; DermNet; AFP 2009
• Adulterated Herbal Creams — found undeclared in 3 unlabelled ‘herbal’ creams, source: Ramsay ADC 2003
• Colloidal Oatmeal — the two FDA OTC ‘allowed actives’ for eczema claims, source: Hebert 2020
• Chamomile — 0.5% hydrocortisone comparator in Kamillosan half-side trial, source: Patzelt-Wenczler 2000
• Breast Milk — hydrocortisone 1% comparator; no difference at 21 days, source: Kasrae 2015
• Fingertip Unit — NHS advises FTU dosing, source: NHS
• Nappy Rash — low-potency steroid indicated; US OTC label excludes it, source: AFP 2009; FDA M017
• FDA — OTC monograph limits to ≤1% and age 2+, source: FDA M017
• Clobetasone Butyrate — next step up (moderate) if mild fails, source: NICE CG57; DermNet
• Drool Dermatitis — short mild course on medical advice for inflamed drool rash, source: Healthline
• Fucidin H — 1% hydrocortisone acetate combined with fusidic acid for infected eczema, source: Fucidin H PIL
• Parent Experiences — parent reports (anecdotal), source: round-10 forum threads