For a child aged 2-5 years, cyanosis

Cyanosis is a bluish discoloration of the skin and mucous membranes that occurs when the blood contains an increased amount of reduced hemoglobin. Respiratory insufficiency, heart diseases, poisoning with nitrates, sulfonamides, aniline, congenital heart diseases, and congenital pathological forms of hemoglobin can cause cyanosis. It appears more prominently in areas where the skin is thin and blood flow is slow, such as on the face, tip of the nose, lips, earlobes, fingertips, and nails.
For a child aged 2-5 years, cyanosis is a symptom that manifests as a bluish or purplish discoloration of the skin, particularly noticeable on the lips, fingertips, and toes. This change in coloration is typically due to insufficient oxygenation of the blood, which can indicate an underlying cardiovascular or respiratory issue.

Source | Author Doctor Nikas Samuolis, reviewed by Prof. Virginijus Šapoka | Vilnius University | Faculty of Medicine | Head of the Department of Internal Medicine, Family Medicine, and Oncology