| Signs | Deficiencies |
Hair | Alopecia | Severe undernutrition, zinc deficiency |
Brittle | Biotin, severe undernutrition |
Color change | Severe undernutrition |
Dryness | Vitamins E and A |
Easy pluckability | Severe undernutrition |
Skin | Acneiform lesions | Vitamin A |
Follicular keratosis | Vitamin A |
Xerosis (dry skin) | Vitamin A |
Perioral and perianal bullous dermatitis (wet, flaming-red plaques) | Zinc |
Ecchymosis | Vitamin C or K |
Intradermal petechiae | Vitamin C or K |
Erythema (especially where exposed to sunlight) | Niacin |
Hyperpigmentation | Niacin |
Seborrheic dermatitis (nose, eyebrows, eyes) | Vitamin B2, vitamin B6, niacin |
Scrotal dermatitis | Niacin, vitamin B2, vitamin B6 |
Eyes | Angular palpebritis | Vitamin B2 |
Corneal revascularization | Vitamin B2 |
Bitot spots | Vitamin A |
Conjunctival xerosis, keratomalacia | Vitamin A |
Mouth | Angular stomatitis | Vitamin B2, vitamin B6, vitamin B12 |
Atrophic papillae | Niacin |
Bleeding gums | Vitamin C |
Cheilosis | Vitamin B2, vitamin B6 |
Glossitis | Niacin, folate, vitamin B1, vitamin B2, vitamin B6, vitamin B12 |
Magenta tongue | Vitamin B2 |
Extremities | Genu valgum or varum, metaphyseal widening | Vitamin D |
Loss of deep tendon reflexes of the lower extremities | Vitamins B1 and B12 |