I would recommend that you take your daughter to see a dermatologist for a full assessment. A dermatologist can provide the best advice on how to care for your daughter's skin condition, as well as prescribe any necessary medications and treatments. Be sure to use gentle soaps and moisturizers and avoid harsh chemicals or fragrances.

The transparent liquid you see coming out is likely pus, a sign of infection. Try cleaning the wound daily with mild soap and warm water, then apply an antibiotic ointment. Keep it covered with a bandage to protect it. If it doesn't improve in a couple of days or if you notice increasing redness, swelling, or warmth around the wound, it's best to seek medical help. 

Please share more details regarding your problem for better evaluation and advice.

Stretch marks are common and appear when the skin is stretched significantly. They can be purple, red, or silver, depending on how long they’ve been there. Causes include rapid growth, weight changes, and pregnancy. Solutions include using moisturizers, and creams, and maintaining a healthy weight. While they usually fade over time, they may not completely disappear.

Nose pie­rcings sometimes get infe­cted. Redness, swe­lling, pus appear when germs e­nter. Soframycin ointment doesn't tre­at piercing infections. Saline solution (saltwate­r) gently cleans the are­a. Rinse piercing multiple time­s daily. If symptoms persist beyond seve­ral days, consult a doctor. Avoid over-the-counter antibiotic cre­ams; they aren't effe­ctive for piercings.