We have been going to Mariwalla Derm. for many years. Dr. Mariwalla is phenomenal. She is…read morethoughtful and very comprehensive. Her office could be run a little better, but I guess that is a result of how busy they are and how many folks are all in the waiting room. But, since the service she provides is excellent, I would not go elsewhere and will deal with the front desk.

Completely wasted my time. Gave me a 7:45 appointment and nobody was even in the office. I left a…read morenote on the desk for a call back to reschedule after waiting a half hour and nobody even had the consideration to call me back. Usually when people make appointments during the week they are making time in their work schedule to make the visit which is extremely inconsiderate. Why send out a confirmation text message if you aren't going to even be at the appointment yourself? Zeroooo Updated based on the poor response: Implying I went to the wrong office just shows the lack of accountability by the team here. I'm old enough to read the sign on the building/door... I don't need anyone to call me now I'll go elsewhere. There's always some weird excuse in the reviews here where the customer always seems to be making something up because there's no way the office could own up to a mistake. A helpful tip for future business responses would be something along the lines of ...(We apologize for the inconvenience and value your time. I am not sure what went wrong but if it helps we will fit you in at your availability). Imagine getting a response like that? I guess I went to a phantom office where all the employees are invisible. Silly me.

I've been a loyal patient of Schweiger Dermatology in Smithtown for years and have always had…read morepositive experiences, which is why I felt comfortable booking a same-day appointment at the Deer Park location since it's closer to home. Unfortunately, this visit left me feeling uncomfortable, dismissed, and taken advantage of. I struggle with significant anxiety around doctors, especially in clinical settings, and instead of feeling supported, I felt judged and spoken down to. The provider I met with had very poor bedside manner and made assumptions about me and my body within minutes of meeting me. At one point, she even commented that I was "getting bright red" while questioning me, which only heightened my anxiety. I was too nervous to speak up in the moment. What stood out the most was being told multiple times that I "never have to come back" and could just return to the Smithtown location. That felt unprofessional and dismissive--especially given that I had just paid a significant amount out of pocket for the visit. To make matters worse, I was informed that treatment would require a follow-up appointment, leaving me feeling stuck after spending money on a visit that ultimately didn't help me. I deeply regret not staying with my original location. I've referred many friends and family members to Schweiger Dermatology over the years and truly value the practice as a whole, which is why this experience was so disappointing. I sincerely wish my visit to the Deer Park office had reflected the level of care and compassion I've consistently received elsewhere.

I'm extremely disappointed with this office's billing practices. I was sent to collections over a…read more$40 bill despite never receiving a single phone call, email, or piece of mail about any outstanding balance. Had I been notified even once, I would have paid it immediately. I found out only when the collection agency contacted me.

Had to have MOHS surgery yesterday on my ear for basal cell cancer...I had been seen by other…read moredermatologists in the past for this problem (not these offices) and they did not do anything to correct or treat it. Dr. Leftkowitz and his assistant, Danielle were absolutely terrific. Took a while, yes to remove everything. (That is what you would want, no?) but Dr. Leftkowitz was thorough, friendly, humorous and highly-skilled. Danielle, his assistant was incredibly comforting, sweet and professional in every way. Experienced, compassionate, and such a wonderful human being. Felt like an "old" friend. A great team and I am so thankful I had them. Because this issue was not treated properly in the past by others,( it had gone deeper) it was a long, timely procedure, but I felt reassured in their competence in removing all the cancer cells. Had to have the plastic surgeon, Dr. Singer suture up the wound but he took the time to make the best decision in what would cosmetically look best and promote the proper healing. It was a large wound and required numerous stitches, but I felt confident in his decision-making. Dr. Singer is another asset to this dermatology office. ***I honestly DO NOT understand all the terrible previous reviews..the staff here were kind, efficient as they could be considering the incredible volume of patients seen, and very pleasant. Friendly, understanding and highly professional. A definite 5 star experience for me. Pleased with the whole Advanced Dermatology experience here in W. Islip and Amityville with Dr. Flashner.

Absolutely THE WORST front desk experience! Abrasive, dismissive, rude and too busy "doing 3 things…read moreat once" to do any one of them correctly. Horrific front desk staff.

Great office. I recently switched after trying TWO different derms nearby and I won't go into much…read moredetail but they were terrible. This new office is efficient and Dr. Mandel is AMAZING!!

From the owner: Dr. Mitchell J. Mandel is a board certified Dermatologist practicing over 20 years in Manhattan…read more Dr. Mandel graduated from New York University School of Medicine in 1989 and completed his internship in internal medicine in 1990. He completed his residency in Dermatology and Dermatological Surgery at the University of Miami School of Medicine/Jackson Memorial Hospital. Dr. Mandel has co-authored various scientific papers, as well as conducted numerous clinical trials. Dr. Mandel's practice is unique in that it combines Medical Dermatology with Laser, Surgical and Cosmetic Dermatology in an outpatient setting. With access to cutting - edge research and ingredients coupled with his knowledge about skincare, Dr. Mandel formulated his own specialty line of skincare and anti - aging products called Skin Doctor ®. With patient feedback at the cornerstone of product development, Skin Doctor ® taps the most synergistic blends of clinically-proven ingredients and sophisticated technologies to address a variety of skincare challenges caused by environmental assaults and just plain genetics. The brand delivers visibly remarkable results and rave reviews from patients. Dr. Mandel is a volunteer attending physician at Mount Sinai Hospital in New York, a member of the New York County Medical Society, the Medical Society of the State of New York, and is a Fellow of the American Academy of Dermatology.

If there were no stars I'd choose that. The whole place is RUDE, staff and doctor and they all need…read moretweaks with their faces. Thankful that I went with my gut instinct because I wouldn't let them touch me.

Dermatologist in Setauket office popped into Exam room. Spent exactly 1 minute …read more.. Never got close enough to see skin issues on my face....just rattled off 2a sentence stating that she would call in prescription to my pharmacy! So very disappointed! Will never go to Advanced Dermatology again! Can't wait to post a negative review. Joan Flaumenbaum