Chickenpox is one of the childhood illnesses most parents will encounter, and while it is generally mild in young children, the management guidance contains some important specifics — particularly the contraindication to ibuprofen — that are important for parents to know. Understanding what chickenpox looks like, how to manage the itch that is its most distressing symptom, which children need medical attention, and when the child is no longer contagious allows parents to manage it confidently at home while knowing when to seek help.
Healthbooq provides parents with evidence-based guidance on common childhood illnesses including chickenpox, with practical management advice grounded in current NHS and UKHSA guidance.
What Chickenpox Looks Like
Chickenpox is caused by the varicella-zoster virus. It begins with one to two days of fever, headache, and general unwellness before the distinctive rash appears. The rash starts as small red spots that rapidly develop into fluid-filled blisters (vesicles), which then crust over. New crops of spots appear over three to five days, so at any one time the rash shows spots at different stages (some red, some blistered, some crusting). The rash appears on the trunk first and spreads to the face, scalp, and limbs.
The illness is most contagious from two days before the rash appears until all spots have crusted over — typically five to six days after the rash starts. A child can return to nursery or school once all spots are crusted.
Management
The most important thing to know about managing chickenpox is that ibuprofen should not be used. Studies have found an association between ibuprofen use in chickenpox and serious bacterial skin infections (necrotising fasciitis and group A streptococcal infection), and NHS guidance is clear that ibuprofen should be avoided. Paracetamol at appropriate doses is safe and effective for fever and discomfort.
For itch — the most difficult symptom — options include: calamine lotion applied to spots; antihistamines (chlorphenamine/Piriton, licensed from one year, and available over the counter) to reduce itch and also help with sleep; cool baths (not hot, which worsen itch); and keeping nails short and clean to minimise skin damage from scratching. Loose, cool cotton clothing reduces irritation.
Which Children Need Medical Attention
Chickenpox is generally mild in healthy children under ten. Children who need medical assessment include: babies under four weeks; children who are immunocompromised (on chemotherapy, immunosuppressive treatment, or with conditions affecting immune function); children with severe or spreading skin infection (redness, warmth, swelling, pus at spots, or rapid spreading of redness around spots, suggesting bacterial superinfection); a child who appears very unwell beyond what would be expected for chickenpox alone; and children with chronic skin conditions like eczema, which can be more severely affected.
Antiviral treatment (aciclovir) is used for high-risk groups and is most effective when started within twenty-four hours of the rash appearing; if a high-risk child develops chickenpox, urgent medical assessment is needed.
Chickenpox Vaccination
Chickenpox vaccination is not part of the routine UK immunisation schedule (it is in many other countries, including the US), but it is available privately. Children at high medical risk (immunocompromised siblings, children with conditions that make chickenpox serious) may be offered vaccination through NHS referral.
Key Takeaways
Chickenpox (varicella) is one of the most common childhood illnesses, usually mild in healthy children under ten years but occasionally causing complications. The distinctive blister-like rash appears in crops over several days and resolves within ten to fourteen days. Ibuprofen should not be used for chickenpox — it is associated with serious bacterial superinfection in this setting. Management is with paracetamol for fever and discomfort, calamine lotion or antihistamines for itch, and keeping nails short to minimise scratching. Chickenpox is highly contagious until all spots have crusted over.
