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Which test should be done if we having pimples on face, on trunk agr 25 not enough beard

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This presentation - acne on face and trunk, sparse beard at age 25 - strongly suggests androgen excess or androgen sensitivity. The go-to tests are for hyperandrogenism.
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Now I have solid textbook data. Let me provide the comprehensive answer.

Tests to Order for This Clinical Picture

The combination you're describing - acne on face + trunk + sparse beard at age 25 - points to a hormonal/androgen axis problem. This is a classic presentation that needs a structured workup.

Why This Combination Matters

Acne (especially truncal acne) and poor beard development at 25 are both androgen-dependent. But they seem contradictory:
  • Acne = androgen excess (or end-organ sensitivity)
  • Sparse beard = possibly androgen deficiency OR androgen receptor insensitivity
This combination often points to partial androgen insensitivity, 5-alpha reductase issues, or a specific hormonal imbalance where different tissues respond differently.

First-Line Tests to Order

1. Androgen Panel

TestWhat It Tells You
Total Testosterone (morning, 8-10 AM)Overall androgen level
Free TestosteroneBiologically active fraction (most important)
DHEA-S (Dehydroepiandrosterone sulfate)Adrenal androgen source
AndrostenedionePrecursor androgen
SHBG (Sex Hormone Binding Globulin)If high SHBG: low free T despite normal total T
Normal serum values (Berek & Novak's Gynecology): Total testosterone 20-80 ng/dL; Free testosterone 0.6-6.8 pg/mL; DHEA-S 100-350 µg/dL; Androstenedione 20-250 ng/dL

2. Gonadotropins (LH & FSH)

  • Elevated LH + FSH with low testosterone = primary testicular failure (hypergonadotropic hypogonadism)
  • Low LH + FSH with low testosterone = hypothalamic/pituitary problem (hypogonadotropic hypogonadism)
  • Goldman-Cecil Medicine: "Elevated serum LH and FSH together with low serum testosterone indicate pan-testicular failure... Low FSH, LH, and testosterone indicate hypothalamic-pituitary failure"

3. 17-Hydroxyprogesterone (17-OHP)

  • Rules out Congenital Adrenal Hyperplasia (CAH) - especially non-classical/late-onset form
  • Done fasting in the morning
  • If borderline: do ACTH stimulation test

4. Prolactin

  • Hyperprolactinemia suppresses GnRH → lowers LH/FSH → lowers testosterone
  • Can cause both acne and reduced secondary sexual characteristics

5. Thyroid Function (TSH, Free T4)

  • Thyroid disorders can affect androgen metabolism and skin

Second-Line / Targeted Tests

SuspicionTest
Androgen receptor problemGenetic testing (AR gene mutation - partial AIS)
5-alpha reductase deficiencyDHT levels (dihydrotestosterone)
Klinefelter syndrome (XXY)Karyotype (especially if small testes)
Adrenal tumorCT adrenals if DHEA-S very high (>700 µg/dL)
Pituitary causeMRI pituitary (if LH/FSH low)
Insulin resistanceFasting glucose, insulin, HOMA-IR (acne can worsen with hyperinsulinemia)

Additional Skin-Specific Tests

  • Skin swab/culture if acne is inflammatory/pustular (to rule out bacterial/fungal superinfection like Pityrosporum folliculitis on trunk)
  • Skin biopsy only if unusual presentation

Summary: Minimum Workup to Start

  1. Morning total + free testosterone
  2. LH, FSH
  3. DHEA-S
  4. 17-OHP (fasting, morning)
  5. Prolactin
  6. SHBG
  7. TSH
These 7 tests together will map the entire androgen axis and point toward the diagnosis.
Bottom line: The combination of truncal acne + poor beard growth at 25 is not typical acne - it needs a full hormonal workup. The most likely findings will be either a relative androgen imbalance, partial androgen receptor sensitivity, or a low-grade adrenal/gonadal disorder. Don't just treat the acne topically without investigating the cause first.
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